Recently we started stress testing our application (an XMPP based chat server) using YJP 11.0.9. During our test we noticed following strange behavior. Sampling shows sun.misc.Unsafe.unpark(Objec...

I am trying to profile remote applications that are deployed within Jboss. So far I can connect to the remote server and see my applications, I am also able to connect to the applications. But when...

In my work, we are running into a difficult to reproduce OOM issue. Or, more accurately, it is very easy to reproduce on one system, making that system unusable, but difficult to reproduce anywhere...

The retained size of an object doesn't equal the retained size of all the objects referred by it. Here is what is happening: Using YourKit to capture memory snapshot. click on an object & sh...

I'm currently performance hunting. In order to measure the throughput, and to enforce that we don't regress, I'm using the wonderful JMH. When I come across something that is slow though, I want t...

On a windows 2012 RT (x64) TEST server we are running a Tomcat 8 installation and the CPU usage is disconcerting in its regularity of hitting peak usage. The behavior is happening after an install...

Which profiler is better for general purpose profiling and heap analysis? 90% of our apps are standalone command line programs with substantial database and numeric processing. The other 10% ...

HERE IS THE HEAD DUMP (UPDATED ON 10/29/2013) I'm working in a webapp with: Tomcat 7.0.24 Java 6 Spring 3 (with aop - cglib) SLF4J over Log4j Oracle Coherence After a lot of work, I managed to...

I have been having occasional problems with a server I wrote. It's in Clojure, but I don't think that matters, and we can pretend it's in Java. Anyway, it works fine for hours at a time, but goes i...

I need to peek into the stack of 2 deadlocked threads to analyze the situation. The JVM is live right now and the data is there, but I need some kind of tool to extract it from the process. I only ...

Is there anyway to set a breakpoint in eclipse or another debugger such that the execution stops on the construction of an array? I am particularly interested in the construction of a primitive arr...

I have a C++ code that upon execution: Loads JVM (I have full control on how to load the JVM), and call Java methods (from loaded classes) using C JNI code. The Java code has no Main() and it is a...

I've build a command-line tool in Java, which I would now like to profile with YourKit. I launch the command-line tool with something like: $ java -classpath .:foo.bar.jar com.foobar.tools.TheTool...